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Searching for kagome multi-bands and edge states in a predicted organic topological insulator
- Publication Year :
- 2021
-
Abstract
- Recently, mixed honeycomb-kagome lattices featuring metal-organic networks have been theoretically proposed as topological insulator materials capable of hosting nontrivial edge states. This new family of so-called "organic topological insulators" are purely two-dimensional and combine polyaromatic-flat molecules with metal adatoms. However, their experimental validation is still pending given the generalized absence of edge states. Here, we generate one such proposed network on a Cu(111) substrate and study its morphology and electronic structure with the purpose of confirming its topological properties. The structural techniques reveal a practically flawless network that results in a kagome network multi-band observed by angle-resolved photoemission spectroscopy and scanning tunneling spectroscopy. However, at the network island borders we notice the absence of edge states. Bond-resolved imaging of the network exhibits an unexpected structural symmetry alteration that explains such disappearance. This collective lifting of the network symmetry could be more general than initially expected and provide a simple explanation for the recurrent experimental absence of edge states in predicted organic topological insulators.
Details
- Database :
- OAIster
- Notes :
- We are indebted to Guillaume Vasseur for his help at theinitial stages of this project. We acknowledge ElettraSincrotrone Trieste for providing access to its synchrotron radi-ation facilities and we thank Jun Fujii, Ivana Vobornik andChiara Bigi for assistance in using beamline APE. We alsogratefully acknowledge financial support from the SpanishMinistry of Economy, Industry and Competitiveness (MINECO,Grant No. MAT2016-78293-C6-6-R, MAT2016-78293-C6-4-R andMAT2017-83468-R) and the Ministry of Science and Innovation(MICINN, Grant No. PID2019-107338RB-C6-3 and PID2019-107338RB-C6-4), from the regional Government of Aragon(E12-20R RASMIA project and Formación de PersonalInvestigador, 2018 grant) and the regional Government of theBasque Country (IT-1255-19), from the“Juan de la Cierva”program, and from the European Regional Development Fund(ERDF) under the program Interreg V-A España-Francia-Andorra (Contract No. EFA194/16 TNSI). C. D. is supported bythe Royal Society University Research Fellowship (URF/R1/201158). We acknowledge support of the publication fee by theCSIC Open Access Publication Support Initiative through itsUnit of Information Resources for Research (URICI)., English
- Publication Type :
- Electronic Resource
- Accession number :
- edsoai.on1256624144
- Document Type :
- Electronic Resource